$ git clone -n https://src.fedoraproject.org/rpms/rust-num-bigint0.3.git /var/lib/mock/f40-build-2653347-66900/root/chroot_tmpdir/scmroot/rust-num-bigint0.3
Cloning into '/var/lib/mock/f40-build-2653347-66900/root/chroot_tmpdir/scmroot/rust-num-bigint0.3'...
$ git fetch origin 5a171abd882636d056ae6b3f5024968d5c1c2e13:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-num-bigint0.3
 * [new ref]         5a171abd882636d056ae6b3f5024968d5c1c2e13 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5a171ab Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild